A5091911742- Advanced DC-DC Converters
- Multilevel Inverters and Converters
- Silicon Carbide Semiconductor Technologies
- HVDC Systems and Fault Protection
- Microgrid Control and Optimization
- Photovoltaic System Optimization Techniques
- Cognitive Science and Mapping
- Power Systems and Technologies
- Creativity in Education and Neuroscience
- Electronic Packaging and Soldering Technologies
- Advanced Welding Techniques Analysis
- Frequency Control in Power Systems
- Mining Techniques and Economics
- Team Dynamics and Performance
- Smart Grid and Power Systems
- Management and Optimization Techniques
- Optimization and Mathematical Programming
- Power Systems and Renewable Energy
- 3D IC and TSV technologies
Wuhan University
2019-2024
University of Wisconsin–Stout
2016
National Yang Ming Chiao Tung University
2007-2012
An input-independent and output-series modular dc-dc converter with multiple input ports high voltage conversion ratio can apply well to medium-voltage dc interface of distributed photovoltaics (PV). However, PV power mismatch will result in output imbalance the submodules (SMs), which is contrary standardized multimodule design. In this article, a multiport low-loss series LC balancing unit (PBU) proposed address problem. isolated employed as SM, consists full-bridge (FB) circuit on side...
In traditional DC distribution networks with both a low-voltage (LVDC) and medium-voltage (MVDC) bus, units are connected to the LVDC bus through converters. this approach no galvanic isolation is provided two power conversion stages needed between MVDC grid, hence leading high number of converters higher costs. To address these shortcomings, paper proposes novel multi-port solid-state transformer (MDCSST) interface directly bus. Multiple modules in series on medium voltage side whereas...
To construct the bipolar dc microgrid and maintain poles voltage balanced, usually a dedicated balancer (VB) is needed. In this article, general four-port converter with series <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LC</i> (LCVB) proposed to replace VB. The composed of two partial power processing dual-active bridges (PDABs) branch. branch added between outputs PDABs, which are combined half-bridge circuits form LCVB. Two PDAB inputs...
A multiport dc/dc converter with cascaded submodules (SMs) can be employed in a photovoltaic (PV) power generation system for its high step-up ratio. Consisting of multiple low-voltage (LV) input ports and one high-voltage (HV) output port, the is more likely to suffer short-circuit faults than two-port converter. To ensure reliable operation converter, fault-tolerant capability should necessarily considered. In this article, topology PV proposed satisfy requirements fault tolerance ability....
DC-DC converters with output-series cascaded submodules (SMs) are required for the medium-voltage direct current (MVDC) grid interface of photovoltaic (PV) systems. However, mismatched power PV arrays can cause an imbalance among output voltages SMs. In order to address this problem, in paper, a multi-port converter is established on basis voltage balancer (VB) novel feedforward voltage-balancing control strategy. The has multiple input terminals and terminal connected MVDC grid....
Using retired power batteries in battery energy storage systems (BESS) is beneficial for environmental protection and cost reduction. Modular multilevel converter (MMC) the most promising structure conversion (PCS) integrated with batteries. However, MMC-based BESS, inter-submodule (SM) active disparity inevitable. It will lead to an increase fundamental circulation capacitor voltage ripple, limiting usable capacity of battery. This paper proposes a bidirectional three-port (BTPC)...
The input independent output series dc/dc converter has one stage of power conversion, which low cost and high efficiency. However, shadow occlusion, dust coverage, manufacturing differences will cause mismatch the photovoltaic panels, in turn causes an unbalanced voltage. To avoid device damage degradation caused by voltage, a novel topology based on multiwinding transformer is proposed. By multiplexing switches each sub-module (SM), this can transmit mismatched among all SMs balance...
The input-independent and output-series (IIOS) structure is often used in the high step-up ratio converters required for medium-voltage dc (MVdc) grid interface of photovoltaic (PV) systems, which achieves voltage gain ensures efficiency. However, due to characteristics IIOS structure, when some PV arrays are shadowed or malfunction, generated power these modules will be mismatched. Mismatched result output capacitor voltages deviating from rated value, not conducive standardized multimodule...
In order to maintain the voltage balanced of long bipolar low-voltage dc supply and utilization system, multiple distributed balancers (VBs) are demanded. A four-port converter with dual <italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">LC</i> balancing branches is proposed in this article reduce hardware cost a VB. The consists two active bridges (DABs) branches. DAB full-bridge circuits on grid side form interleaved VBs. integrates device...
Hexagonal modular multilevel converter (HMMC) is a full-bridge ac/ac converter, and it can achieve the interconnection between ac grid low frequency system. However, coupling of input output on branches causes large fluctuation both in dc voltage submodules (SMs) branch currents. Moreover, internal circulating current comprises component components, which an increase stress. The traditional control HMMC adopts injection for stability, cannot decrease Therefore, basing analysis, generating...
We investigate the cross-interaction in Cu/SnAg/Ni microbumps with a reduced solder thickness of 30 and 10 μm. The concentration Ni atoms at opposite site increased decrease solder-height. A considerable gradient was detected 10-μm sample, which strongly triggers diffusion to Cu side. diffused side form ternary intermetallic compounds (Cu,Ni)6Sn5, possesses lower free energy than Cu6Sn5 does. Eventually, growth Cu3Sn inhibited due formation thermodynamically stable (Cu,Ni)6Sn5.
Nonagonal modular multilevel converter (NMMC) is a three-port ac/ac/ac conversion converter, and it can achieve the connection of two fractional frequency transmission systems (FFTSs) as wind power collection to ac grid. However, grid low-frequency brings challenges branch balance, which may cause dc voltage fluctuation submodules (SMs). According model construction, relation between imbalance quantified in this article. Based on balance condition, neutral offset decoupling control proposed...
This study examined the relation between research and development (R&D) performance fit a researcher's cognitive type task demand of project that was implied in Wang, Wu & Horng's (1999) study. Three hundred eighteen projects completed by 205 leaders 3 years were classified into Unsworth's four creativity types along two dimensions: (1) whether addressed an open‐ or closed‐ended problem (2) assigned actively sought researcher. Each personal traits assessed using Myers–Briggs Type...
Six Sigma is a tool for business to achieve continuous improvement.The benefits of implementing projects include cost reduction and productivity improvement.Six uses the Define, Measure, Analyze, Improve Control (DMAIC) methodology solve problems.In this study, linear programming approach was used in improve control phases project find truck scheduling ABC Transportation Companyto reduce their shipping cost.The key variables probability distributions were identified analyze phase.The study...